Guetta tried offering the vocal out to different singers including Mary J Blige, but it was Katy Perry who cemented the song as Sia's first number one single.

Perry said: "I had just come off 'Firework' and didn't want to repeat myself. I have to balance out my anthems, or else I'll just be a motivational speaker. I was like, 'I think you're crazy not to just keep Sia'."

Unbeknown to Sia, Guetta released the track with her original demo vocals and it became a hit. However the Australian singer-songwriter wasn't impressed, commenting to The New York Times: "I was really upset about it, because electronic dance music is not my kind of music."

"Of course, it turned out to help my career as a songwriter," she added.